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Welding seam image extraction fitting-based welding stress deformation prediction method and system

A technology of welding stress and prediction method, which is applied in the field of welding processing and can solve problems such as poor simulation accuracy of temperature field

Active Publication Date: 2018-05-11
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0009] In view of the above defects or improvement needs of the prior art, the present invention provides a welding stress deformation prediction method and system based on weld image extraction and fitting, the purpose of which is to accurately simulate the temperature field through image extraction and fitting, thereby effectively solving the problem of The temperature field simulation accuracy problem of full penetration welding with necking characteristics and dissimilar material welding is poor to ensure accurate simulation calculation of stress and deformation in the welding process

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  • Welding seam image extraction fitting-based welding stress deformation prediction method and system
  • Welding seam image extraction fitting-based welding stress deformation prediction method and system
  • Welding seam image extraction fitting-based welding stress deformation prediction method and system

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[0047]In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0048] refer to figure 1 As shown, the numerical calculation method of welding stress and deformation based on weld image extraction and fitting of the present invention includes the following steps:

[0049] Step 1: Image extraction and fitting: Based on the actual appearance of the weld, image processing methods are used to obtain the contour lines of the weld area and the base metal area, and...

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Abstract

The invention discloses a welding seam image extraction fitting-based welding stress deformation prediction method and system, and belongs to the field of welding machining. The method comprises the steps of 1, obtaining a contour line based on a welding seam image, and performing fitting to form a function curve; 2, building a three-dimensional geometric model of welding seam appearance based onthe function curve, dividing a temperature field unit in the three-dimensional geometric model, and setting a thermophysical parameter, a thermal input and a boundary loading quantity of a welding material, thereby obtaining a transient temperature field; and 3, selecting a stress field unit from the three-dimensional geometric model, setting a mechanical physical parameter of the welding material, and loading a parameter of the transient temperature field to a node corresponding to the stress field unit, thereby obtaining transient stress and deformation distribution. The system comprises a module for executing the method. The temperature field is accurately simulated through image extraction and fitting; the problem of poor precision of non-uniform temperature field simulation is effectively solved; and accurate simulation calculation of stress deformation of a welding process is ensured.

Description

technical field [0001] The invention belongs to the field of welding processing, and more specifically relates to a welding stress deformation prediction method and system based on welding seam image extraction and fitting. Background technique [0002] At present, fusion welding (laser welding, arc welding, electron beam welding, etc.) is one of the important processes in the manufacture of complex structural parts, and has been widely used in many fields such as aviation, aerospace, marine, and energy. During the welding process, the heat source and its surroundings are rapidly heated to melt, which will squeeze the surrounding solid metal; during the cooling process of the weld after the heat source passes, the surrounding solid metal will be stretched. The local extrusion effect caused by the rapid melting process of the weld leads to the internal mechanical imbalance of the weld and its surroundings, which will inevitably cause stress deformation and seriously affect th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/13G06T17/00
CPCG06T7/0004G06T17/00G06T2207/20032G06T2207/30152G06T7/13
Inventor 荣佑民黄禹龚时华徐加俊雷艇蒋平王兵
Owner HUAZHONG UNIV OF SCI & TECH
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